By Harry Davies Alex Pereira KO’d Jamahal Hill at UFC 300 to defend his light-heavyweight world title. Pereira was looking to make the first defence of his belt at the mega-event since winning the title with a KO against Jiri Prochazka last November. Former champion Hill was fighting for the chance to win the belt that he never officially lost, but was forced to vacate after rupturing his achilles. The champion landed some good kicks early on and hill just missed with a big overhand counter. Hill landed a low blow with a body kick but Pereira didn’t want to halt the action and dropped the Amer…